By Kalof, Linda, Satterfield, Terre
By Maslin, Mark
By David Coley
By Leiper, Neil, Harris, Rob
By Cole, Brandon;Michael, Scott
By Sinclair, Ian, Ryan, Peter
By Inskipp, Carol
By Smith, Tilly
By Chambers, Nicky
By DK
By SARA OLDFIELD
By World Conservation Union
By Shine, Clare, Williams, Nattley
By Gavron, Jeremy
By David Holmgren
By Bruce Parry, Jane Houston
By Martin, Stella
By Bradman, Tony
By de Waal, Frans
By Magdalena, Carlos
By Merkel, Jim
By David Orme
By Anna Claybourne
By Food and Agriculture Organization, Bondad-Reantaso, Melba G.
By Caughley, Graeme, Sinclair, Anthony R. E.
By Food and Agriculture Organization, Hasan, Mohammad R.
By Sleeth, M.D. J. Matthew, Hunter, Joel C. Dr.
By Nimis, Pier Luigi, Scheidegger, Christoph, Wolseley, Patricia A.
By Baines, John